The Schroder M2 works with the mounting hole and geometery, but would require you to drill 3 mounting holes and either tap them, or use appropriate screws depending on which arm board you have. I know, I just swapped out an OL Silver [available BTW ;~)]for an M2. Its a bit hairy; you have to properly center the arm collar in an oversized mounting hole and then mark the mounting hole locations, then drill them accurately- A drill press is highly recommended. I did it to a monkeywood armboard and it brass (them must be non-magnetic) wood screws worked; if the wood was harder (cocobolo, ebony) or if it was a metal armboard, it would have to be drilled and then tapped for a nonmagnetic bolt (stainless or brass). NOT simple drop in like the Rega derivatives.
